Motor attachment for bicycles.



G. S. SCHUNK.

MOTOR ATTACHMENT FOR BICYLES.

APPLICATION man 153.18. 1915.

T 9 l 5&3 l T. Patented. Oct. 26, 1915.

enteren.

Geenen s. scnunk, or wnsr amers, wisconsin.

MOTOR .ATTACHMENT FOR. BICYCIJES.

. Specicatlon of Letters Patent. v' l rateatea oet. ae, raie.

j application mee February is, me. serial No. 9,011.

To all 'whom t may concern.' j

Be it known that I, GEORGE S. SCHUNK, a citizen of the United States, and resident of West Allis, in the county of Milwa'jikee and State of `Wisf'zonsin, have invented-certain new and useful Improvements inyMotor Attachments for Bicycles; and I dohereby declare that the following is a full, clear, and exact description thereof. j My invention has for its object to provide a simple, economical and eective motor attachment for bicycles, wherein the same may bequickly converted into selfpropelled vehicles without cutting oriittin that would require the services fof a skille mechanic.

With the above objects in view the invention consists in what is herein shown, described and lclaimed.

In the drawings Iti ure v1 represents a fragmentary side elevatlon of a blcycle having attached thereto amotor in accordance with my invention; Fig. 2, a'sectional plan view of the same, the section bein indicated by line 2-2 of Fig. 1, and Il`1g. 3, a.

detailed cross-section vof a motor and its ttt driving connection with the rear Wheel of a bicycle, the section being indicated by line 3*-3 of' Fig. 1. f

Referring by characters'to the drawin s, 1 represents the usual rear drive wheel o a bicycle, which wheel is supported upon an axle 1 that is mounted in a cluster formed by lower and upper rear. fork members 2, 2, respectively. The lower fork member is connected Ato the crank-hanger 3A of the' frame, from which also extends the usual seat-mast 3. The upper. portion of ,the seat-mast serves as a point of connection for the fork member 2 and a reach-*bar 3 of the frame. Secured to the mast is a twopart clip member 4, 4 the member 4 being provided with a centrally apertured hub' 5.

The said clip members are secured together by clamp bolts, as shown, whereby the parts can be readily attached or detached. j

6 indicates the cylinder of a motor casing and the outer end of said cylinder has extending therefrom spaced ears 7, 77which ing carrying'a friction'drivin pulley 11, which pulley is adapted to be he d in-driving contact with the tread jof the drive-wheel 1 by the weight of the motor, which is in pi-v-" otal connection, as stated, with the frame, and thus is capable of floating at its free end to lcompensate for variations in the tread of the, drive-wheel and to facilitate a positive smooth driying connection between the friction wheel; 11 and the said rear drive-wheel of the vehicle.

In this exemplification of myinvention the fuel tank 12 is shown attached to the" rnotor casing and arranged to overhang the drive wheel of the vehicle, but it is understood that I may, without departing from the spirit. of my invention, attach the tank to any suitable part of the vehicle frame, if

desired. However, by connecting it asA mentioned, the weight of a fuel supply vserves to add frictional resistance between f` the drive and driven members, whereby the power 1s rendered more positive. 5.,

The motor is equipped with the usual carbureter A, which 1s under control ofa W lever B, the same 4being mounted upon a 1l bracket C, which is secured in any suitable manner to the reach-bar of the vehicleframe.

In some instances Imay, as shown, employ a yielding tie connectlon between the folding end of the motor casing and frame, whereby the friction drive-wheel is positively held in contact with the drive-wheel of the vehicle. The means employed for accomplishing this result embodies a coiled spring 13, which is connected to the crank casing 6 ofV the motor andA the axle 1 of the drive-wheel 1 by a shackle connection and turnbuckle 13, the said turnbuckle berovided for adjusting the tension of the `tie device. 'Ihus the motor is held from 'inadvertent rebound under rough road conditions, whereby driving connection be- ,"tw'eenth sameand the rear wheel of the are formed with alined apertured' end hubs'.

8 that are adapted to register with the clip 'hub 5. The bolt 9'is fitted through the sev-1 mounted therein the usual` motor shaft 10' vehicle is insured at allztimes.

While I have4 shown and described a sirn- `ple form of detachably connecting a motor to a' -footfpropelledy vehicle ofthe character' described, lit'i's.y obvious that I may,lWth0l1 departing fromthe spirit of Y my invention, connect'the motor in any'lioatingma'nner within the knowledge of skilled 'mechanics to form a frictional driving connection between a wheel carried by the motor and the rear drive-wheel of thevehicle.

" extending through the motor-casing, a driv-v ing wheel carried by the crank-shaft adapted to 'engage the tread of the vehicle wheel and a spring-tension connection between the oating end of the motor casing and bicycle frame.

2. In a bicycle having a rear drive-wheel and a frame; the combination of a motor having its cylinder end in pivotal union with the bicycle frame, the crank-shaft end of said motor being adapted to lioat, a crank-shaft extending through the rnotol` casing having a wheel mounted thereon en- -gageable with the tread of the drive-wheel, a spring tension connection between the floating end of the motor casing and bicycle frame, and means for adjusting the tension of said spring.

In test1mony that I claim the foregoing I lhave hereunto set my hand at Milwaukee in the county of Milwaukee and State of Wisconsin in the presence of two witnesses.

GEORGE S. SCHUNK. Witnesses:

GEO. W. YOUNG, M. E. DOWNEY. 

